南川山盆地04—3区块天翁—芒丘构造中中新世沉积岩沉积环境评价

N. B. Pham, N. Tran, Dong Trung Tran, Oanh T. K. Tran
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摘要

沉积环境是评价沉积岩储集潜力的重要科学依据之一。本文重点研究了南松山盆地04—3块田翁—芒丘构造中中新世沉积物的这一问题。本文综合运用测井解释、薄片分析、地震属性分析等方法,结合VPI - Labs的古生物学分析结果,对案例区中中新世沉积环境进行了识别。测井资料解释结果表明,中中新世沉积环境为浅海、岸线、河口坝、三角洲前缘、前三角洲和下三角洲平原。这些发现也与岩石学和古生物学分析的结果相一致。岩石学分析结果表明,研究区主要有2组沉积岩,即碎屑岩和碳酸盐岩。薄片中检测到海绿石粘土具有海洋环境特征,碳酸盐裂变和菱铁矿具有三角洲环境特征。而古生物样品则检测到有机物质,如藻类、沥青;以及有孔虫、大盖和Oc盖等化石,它们是浅海环境的典型特征。构造中中新世碳酸盐岩沉积地震属性分析结果表明,碳酸盐岩主要集中在中东部隆起区。这种分布在西部较少。这一发现与该地区(井:C - 1X、C - 2X、C - 3X和C - 4X)的井对比一致,也符合沉积原理。
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Depositional Environment Assessment of the Middle Miocene Sedimentary Rocks in Thien Ung - Mang Cau Structure, Block 04 - 3, Nam Con Son Basin
Sediment depositional environments are one of the important scientific bases in evaluation the reservoir potential of sedimentary rocks. This article focuses on studying this issue for Middle Miocene sediments, Thien Ung - Mang Cau structure, Block 04 - 3, Nam Con Son basin. The article has integrated the methods of well log interpretation, thin section analysis and seismic attribute analysis, combined with the results of paleontological analysis of VPI - Labs to identify depositional environments of Middle Miocene sediments in the case study area. The results of interpreting well log data show that the Middle Miocene sediments were deposited in the following environments: shallow marine, shoreline, mouth bars, delta front, prodelta and lower deltaic plain. These findings are also consistent with the results of petrographic and paleontological analysis. The results of petrographic analysis show that in the study area, there are 2 main groups of sedimentary rocks, which are clastic and carbonate rocks. In the thin sections, the following components were detected: glauconite clay is characterized of marine environment, carbonate fission and siderite ore which are characteristic of deltaic environments. While paleontological samples detected organic materials, such as algae, bitumen; and fossils such as Foraminifera, Da Gai and Oc Gai - typical for shallow marine environments. The results of the seismic attribute analysis for the Middle Miocene carbonate sediments of the structure have clarified that the carbonate is concentrated in the central and eastern uplift area. This distribution tends to fewer in the west. This finding is consistent when the authors compared to well correlation in the area (wells: C - 1X, C - 2X, C - 3X and C - 4X) and also logically with the sedimentary principles.
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